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United States Patent | 5,261,014 |
Bruno ,   et al. | November 9, 1993 |
An optoelectronic device having an optical guide and photodetector integrated on a common substrate is provided with a light coupling means for increasing the absorption of light within the photodetector. This means consists of freeing the lower portion of the guide layer--opposite the photodetector--to bring it into contact with air. The use of air has the effect of repelling the light propagating through the guide layer towards the absorbent layer of the photodetector thereby increasing the photodetector efficiency.
Inventors: | Bruno; Adrien (Palaiseau, FR); Menigaux; Louis (Bures Sur Yvette, FR) |
Assignee: | France Telecom Etablissement Autonome de Droit Public (Paris, FR) |
Appl. No.: | 939614 |
Filed: | September 2, 1992 |
Sep 06, 1991[FR] | 91 11044 |
Current U.S. Class: | 385/14; 385/27; 385/29; 385/30; 385/31; 385/39; 385/48; 385/50 |
Intern'l Class: | G02B 006/26 |
Field of Search: | 385/14,27,29,30,31,39,43,48,50,51,129 |
5138676 | Aug., 1992 | Stowe et al. | 385/32. |
5170448 | Dec., 1992 | Ackley et al. | 385/31. |
Foreign Patent Documents | |||
0278408 | Aug., 1988 | EP. | |
286528 | Oct., 1988 | EP | 385/14. |
0361159 | Apr., 1990 | EP. | |
2655775 | Jun., 1991 | FR. | |
3-13906 | Jan., 1991 | JP | 385/14. |
4-57003 | Feb., 1992 | JP | 385/14. |
2220083 | Dec., 1989 | GB. |
Patent Abstracts of Japan, vol. 8, No. 115(E-247)(1552), May 29, 1984, & JP-59-29472, Feb. 16, 1984, Kiyotaka Wasa, et al., "Substrate For Thin Film Optical Waveguide". |